Also interesting: deep sleep therapy where you keep the patient asleep for days or weeks. Mixed results back then; I imagine they didn't have good ways to differentiate the patients who would be helped vs harmed by the therapy.
1) Non-Sleep Deep Rest (NSDR): Exploring a World Beyond Sleep - https://positivepsychology.com/non-sleep-deep-rest-nsdr/
2) NSDR, Meditation and Breathwork - https://www.hubermanlab.com/topics/nsdr-meditation-and-breat...
3) Neuroscience of Sleep - https://en.wikipedia.org/wiki/Neuroscience_of_sleep